In the sortable statistics reports, these can be displayed for any choice of years and levels (MLB, Triple-A, etc.).
On the Player Card pages, these are displayed for both the current (or most recent) season, as well as a career-long "Multi" combination, which weights plate appearances by a factor of:
(.5) ^ ([current year] - [year])
... so the current season is weighted 100%, the previous season 50%, etc.